MTS WIFT Mini Transducer Interface - Manual (Page 68)

SWIFT ® Mini TI 68
Zero the Transducer Interface
Installation
4. Rotate the tire in either direction until the lower Zero indicator turns off and
the upper indicator turns on (approximately 1.25 revolutions). The bridge
zeros will be computed using the average value of the bridges over one full
revolution. The angle offset will be calculated using a sine curve fit to the
raw bridge data. Once the computation is complete, both Zero indicators
will turn off.
Note If the red Fail indicator lights a problem was detected during the zero
process. Try repeating the procedure. Use TI2STATUS for a more
detailed explanation of the problem. If you continue to have an error,
consult the chapter
“Troubleshooting” on page 73.
Zero the TI – one
revolution averaging
with inclinometer
(unloaded)
ZeroAlgorithm=1.
Recommended for spinning applications… (Angle Mode = 0)
(The TI will read the angle when the zero button is pressed and will use this as
the angle offset. It will then collect one revolution of raw bridge data, average the
data, and remove the DC offset by setting the zero offsets to the average value)
When you zero the TI, you want the vehicle to be fairly level and the transducer
to be as close to plumb as practical.
1. Raise the vehicle with a lift or with jacks until each wheel is off the road
surface.
The vehicle should be raised in a level manner, such that the orientation of
the anti-rotate bar is the same in the lifted position as it was in the grounded
position
Note Perform the remainder of this procedure completely for one transducer/
TI box combination at a time.
2. Rotate the tire one full revolution so that the encoder can find the zero index
mark.
Note The encoder has a red dot on the mounting flange connected to the
slipring bracket and a black dot on the slip-ring connector housing where
it interfaces with the mounting flange. These dots, when aligned next to
each other, indicate the index mark is under the encoder sensor.
3. Rotate the tire, as necessary, until the Fz on the axes icon (see the next
figure) printed on the transducer label is pointing up.
4. If not already assembled, attach the inclinometer to the level bracket using
the two 6-32 UNC fasteners provided. Apply Locktite 222 to the threads on
the fasteners. Torque each fastener to 2 N•m (18 lbf•in).
5. Install the inclinometer/level bracket assembly on the transducer by
inserting the dowel pins in the level bracket into the pin pilot holes provided
in the transducer, as shown in the next figure. The orientation of the
inclinometer/level bracket assembly is determined by the orientation of the
anti-rotate bracket.
6. Adjust the tire rotation, as necessary, until the inclinometer reads 0.0°, ±0.1°
(or 90.0°, ±0.1°) depending on the orientation of the inclinometer as shown
in the previous figure.